NY27

I just picked up a used DMPS AR-15. It's actually a model A-15. I field stripped it and noticed that there was no "O" or "D" ring around the spring for the extracter. When I strip my Bushmaster M4 at work there is a "D" ring. I assume that the DMPS should have one also.

I'll be shooting it tomorrow so I'll see if there are any issues.

Can anyone enlighten me. Shouldn't the DMPS have an "O" ring as well? Or did the original owner lose it while cleaning the weapon?

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It is better to have your gun and not need it, than to need it and not have it.

2012

Ram Rod

The "D" ring, or 'D-fender' is an aftermarket mod. Not factory that I know of. That, the 'perma-pin', and the 'wedge' are all aftermarket mods that are worthwhile on the typical AR rifle. Not factory on anything I know of.
AR-15/M16 D-FENDER D-RING
KNS PERMA PIN
AR-15 Buffer Increases Accuracy Wedge - GUNSMITHING TOOLS by Combathunting.com

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RamRod-----sans remords

Bob The Great

Mine doesn't have one, and it shoots just fine. If you shoot it and it has extraction issues, it might be worth a try.

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Shizzlemah

I have a DMPS A-15 in the 6xx serial range. No ring, no issues. As ramrod said, it is an aftermarket add-on.

And the sooper secret trick - it is a standard #60 VITON o-ring. Viton, as in "dont try one from your local hardware store"

JT

Not to be picky, but it's DPMS. Not DMPS.

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Blessed be the Lord my rock who trains my hands for war and my fingers for battle. Psalm 144:1

Si vis pacem, para bellum

bobcat35

never had one on any of my AR's have yet to encounter any extraction issues(just feeding due to mags older than i am)

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"Nothing in life is so exhilarating as to be shot at without result."
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NY27

I know. My fingers got ahead of me.

__________________
It is better to have your gun and not need it, than to need it and not have it.

2012

NY27

WOW. I just realized that my fingers got ahead of me a lot on that thread.: tired:

__________________
It is better to have your gun and not need it, than to need it and not have it.

2012

NY27

Thanks to all for the replies. The only carbine I had stripped was my M4 at work. I guess that the armorer had put them in all the Bushmasters after they had suggested so. One of out rifles was failing to extract every few rounds.

I'll see how the DPMS works tonight. I have to sight her in.

__________________
It is better to have your gun and not need it, than to need it and not have it.

2012

Skygod

As others have already said, most complete rifles (AR15's) do not come standard with the an "O" ring or D-Fender ring.

I got into the habit of ordering them from Brownells just to have on hand and installed in all my extractors.

I keep a mini AR15 tool and parts kits box when I go to machine gun shoots and the range. You'd be surprised how many of those little "O" rings that I have installed into someones new Bushy or DPMS and their extraction problems dissapear once they insert a fresh mag and chamber their first round and begin firing.

Most are incredibly thankful and wind up ordering a couple more just to help out fellow shooters at their ranges.

Their a good idea and should one of the first things you do to a new AR.

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